an electric motor lifts an elevator that weighs 1200N a distance of 9m in 15s, what is the power of the motor in watts?

720 W

Explanation:

First let us find the work done of lifting the elevator. The work done can be calculated using the formula WD = F * d where F is the magnitude of force in N and d is the parallel distance moved in m. Hence,

WD = (1200) (9)

= 10 800 J

Power is the rate of work done with the formula P = E/t where E is the work done in J and t is the time in s. Hence,

Power of motor = 10 800 / 15

= 720 W